Adata launches V90 SDXC cards in 64, 128 and 256GB capacities

Adata has become one of the first companies to support the V90 video speed class with its Premier ONE series of SD cards that guarantee 90MB/s sustained read and write: the key specification for stable video capture.

Fast UHS-II cards already exist, promising around 290MB/s peak write speed, but these are often rated as U3 speed, meaning they don't guarantee to be able to reliably write for extended periods at anything over 30MB/s. This means you're taking a risk if you try to shoot with a camera that writes any faster than this (240 megabits per second).

The V90 speed class, announced in 2016, promises three times that performance, allowing up to 720MBps capture. The latest cards are also some of the first to rely on 3D NAND technology, one of the approaches that will be needed to allow cards to get larger and faster.

Although uhd-II came out in 2013 still there are only a few cameras and card readers in the market that support the "new" features. sdxc/uhc-II has got eight additional pins on the back. My FZ1000 with 4k (100mb/s) supports only uhs-I, therefore even with an extreme-pro-card (95mb/s only under best conditions) i won't get full quality out of the box without a hdmi-recorder.

> Jekabs> mwalshyou are absolutely right! thank you for bringing me back on my feet again. i forgot: a bit is not a byte and a gig is not giga ;-) nevertheless i wonder why my best-tested sandisk extreme pro has dropouts in 4k... ?

Archiving on flash memory is not good idea, especially as technology advances. The transistor gate holding the charge which represents your data is getting smaller and smaller and dissipates the charge over time. At first it will be transparently corrected by algorithms checking the missing bits like in scratched CD. Later you will get more errors which will be unrecoverable and your images will be corrupted for good.

Best to have couple independently stored HDDs and rewrite them every couple of years to refresh the data. Bit rot exists and it's real, digital data can live on forever only as long as they are constantly updated and moved to new formats while keeping multiple copies.

jnd: your expectation will not be the same as CD experience. this technology use connected wires unlike magnetic or optical read-write. Data wear-out will be stay there but not soon as CD or HDD. more over new memory technology will use smaller process from a few hundred nm to 16nm. so it will even save more space to make bigger memory capacity chip also result higher speed bandwidth in smaller physical size.

tangbunna: with the CD analogy I was refering to error correction algorithms and how they repair damaged data, mostly transparently and without actual content loss. Solid state memory relies on storing billions of tiny electric charges and those charges dissipate over time. It's unescapable law of nature, entropy grows and data deteriorates over time. Smaller size means cramming more bits into the same space, meaning each bit is represented less robustly and I wouldn't trust keeping my data on SD cards more than couple years. HDD keep magnetic "charge" instead of electrical and face the same problems but still they are more robust storage system. Then you have storage tapes for archving but for end user it's not practical. Archival grade optical media exist (with better materials instead of organic dyes that decompose over time) and can keep data for 100 years but it gets expensive and the volumetric effciency is quite small.

I think you guys are confusing about this new technology. it is not for archiving your whole lot of data in a life time. It is for storing videos in high speed directly from your 4K camera sensors at high bit rate. It is going to replace the need of external HDMI recorder that uses SSD that are not pocket friendly.

Also to expect latest technology of error correction that is going to work faster and more accurate than last year SD cards. At the end you may need cheaper alternative options to store your final works like HDD or Tape.

@Karroly 256GB for me is already too much for important documents in life. unless you need to store all videos, junks and spams. anyway.. this technology is not a life time use. we must migrate our data often.

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